For reasons best known to herself, my wife wants to do the free upgrade to Windows 10 on her laptop which is running Avast Premier 11.1.2245.
If she does this, is my life likely to be complicated by the “free antivirus protection” that comes with W10 messing with Avast, or will the two programs just ignore each other?
Simply reboot your system to Safe Mode with Networking. Once in Safe Mode, reboot your system to regular mode and the problem should be solved.
It’s a known Windows 10 problem not an Avast problem.